It should be realised that ovalisation of the 22mm outer diameter pipes was minimal and difficult to measure.
显然，22毫
管的成椭圆形是最小的且难以测量。
It should be realised that ovalisation of the 22mm outer diameter pipes was minimal and difficult to measure.
显然，22毫管的成椭圆形是最小的且难以测量。
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